US8750869B2 - Heterogeneous communication system and method for processing call in the same system - Google Patents

Heterogeneous communication system and method for processing call in the same system Download PDF

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Publication number
US8750869B2
US8750869B2 US11/999,498 US99949807A US8750869B2 US 8750869 B2 US8750869 B2 US 8750869B2 US 99949807 A US99949807 A US 99949807A US 8750869 B2 US8750869 B2 US 8750869B2
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network
management server
voice call
ims
vcc
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US20080153490A1 (en
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Dong-Hee Lee
Jeong-Sick Chang
Jin-woo Park
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/50—Address allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1073—Registration or de-registration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/12—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal
    • H04M7/1205—Arrangements for interconnection between switching centres for working between exchanges having different types of switching equipment, e.g. power-driven and step by step or decimal and non-decimal where the types of switching equipement comprises PSTN/ISDN equipment and switching equipment of networks other than PSTN/ISDN, e.g. Internet Protocol networks
    • H04M7/1225—Details of core network interconnection arrangements
    • H04M7/123—Details of core network interconnection arrangements where the packet-switched network is an Internet Protocol Multimedia System-type network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2101/00—Indexing scheme associated with group H04L61/00
    • H04L2101/60—Types of network addresses
    • H04L2101/618—Details of network addresses
    • H04L2101/65—Telephone numbers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/104—Signalling gateways in the network

Definitions

  • the present invention relates generally to a method and system for processing a voice call in a communication system, and, in particular, to a method and system for processing a voice call in a communication system that manages heterogeneous networks.
  • the recent mobile communication services have reached the phase of providing not only the existing voice call services but also the high-speed packet data services capable of transmitting high-capacity digital data as well as E-mail and still images via a mobile terminal. Accordingly, the mobile communication systems are evolving from the voice-based Circuit Switched (CS) domain into the packet-based Packet Switched (PS) domain.
  • CS Circuit Switched
  • PS Packet Switched
  • the Core Network (CN) that provides multimedia services over the Internet has changed from the existing circuit-based CN into the packet-based CN, and is now evolving into an Internet Protocol (IP)-based CN.
  • IP Internet Protocol
  • a communication system that provides IP Multimedia services (IM services) to the subscribers over the IP-based CN is called an IMS, and third Generation Partnership Project (3GPP)/3GPP2 is conducting various researches to smoothly provide ALL IP services over the IMS.
  • 3GPP Third Generation Partnership Project
  • the IMS is composed of a set of signaling and bearers related to the network elements, and should be able to approach the web-based technology for audio, video and message data, and wireless subscribers. Because the IMS provides various types of packet data services based on an IP transport protocol, the IMS users can exchange multimedia-type contents, such as picture, video clip and sound clip, with each other over Session Based Messages.
  • PS domain is also called an ‘IMS domain’ and the two terms are used interchangeably.
  • VCC Voice Call Continuity
  • AS VCC Application Server
  • MGCF Media Gateway Control Function
  • the CS domain and the IMS domain are different in their service providers. Therefore, when the user uses the subscriber identification number, or Mobile Station ISDN Number (MSISDN), that is used in the CS domain, even in the IMS domain, all voice calls are rerouted to the IMS domain after terminating at the CS domain. That is, the IMS domain anchors the corresponding call in the VCC AS, and the VCC AS selects a terminating domain and reroutes the call to the corresponding terminating domain, which unnecessarily performing many procedures.
  • MSISDN Mobile Station ISDN Number
  • an aspect of the present invention addresses at least the problems and/or disadvantages and provides at least the advantages described below. Accordingly, an aspect of the present invention is to provide a method and system for fast processing of a voice call in a heterogeneous communication system that manages a CS domain and an IMS domain.
  • Another aspect of the present invention is to provide a call processing method and system for sharing subscriber information between mutual domains in a heterogeneous communication system that manages a CS domain and an IMS domain.
  • a method for processing a call in a heterogeneous communication system that manages heterogeneous networks including a circuit network and an Internet Protocol (IP) Multimedia Subsystem (IMS) network.
  • the call processing method includes registering a User Equipment (UE) in the IMS network by a voice call management server of the IMS network at the request of the UE; receiving by the voice call management server a subscribe message including a subscriber identification number from the UE; allocating by the voice call management server a transfer number needed by the UE to transfer from the IMS network to the circuit network, in response to the subscribe message, and delivering the transfer number to the UE; and performing, by the voice call management server, location registration for the UE in the circuit network using the subscriber identification number.
  • IP Internet Protocol
  • IMS Internet Protocol
  • the call processing method includes registering a User Equipment (UE) in the IMS network by a voice call management server of the IMS network at the request of the UE; receiving by the voice call management server a subscribe message including a subscriber identification
  • a heterogeneous communication system that manages heterogeneous networks including a circuit network and an Internet Protocol (IP) Multimedia Subsystem (IMS) network.
  • the heterogeneous communication system includes a voice call management server for registering a User Equipment (UE) in the IMS network at the request of the UE, and upon receipt of a subscribe message including a subscriber identification number from the UE, allocating a transfer number needed by the UE to transfer from the IMS network to the circuit network, in response to the subscribe message, delivering the transfer number to the UE, and performing location registration for the UE in the circuit network using the subscriber identification number; and a home location register for performing location registration to the circuit network for the UE at the request of the voice call management server.
  • UE User Equipment
  • FIG. 1 illustrates a configuration of a heterogeneous communication system according to an embodiment of the present invention
  • FIG. 2 illustrates an IMS registration method of a VCC subscriber in a heterogeneous communication system according to an embodiment of the present invention
  • FIG. 3 illustrates a terminating call setup method according to an embodiment of the present invention.
  • the present invention provides a system for processing a call by sharing information on a User Equipment (UE) between a Home Location Register (HLR) of a CS domain and a VCC AS of an IMS domain, to efficiently process a terminating call (or incoming call) in a heterogeneous communication system that manages the CS domain and the IMS domain.
  • UE User Equipment
  • HLR Home Location Register
  • VCC AS VCC AS of an IMS domain
  • FIG. 1 illustrates a configuration of a heterogeneous communication system according to an embodiment of the present invention.
  • the terms used in the drawing are defined in 3GPP/3GPP2, as known to those of skill in the art, for conciseness, a separate description thereof is not provided herein.
  • a heterogeneous communication system 100 includes a CS network 110 , an IMS network 120 , and a UE 101 .
  • the IMS network 120 includes a Call Session Control Function (CSCF) 130 for voice call processing, a Home Subscriber Server (HSS) 123 for providing subscriber information, and a VCC AS 121 for taking charge of IMS-to-CS domain transfer.
  • CSCF Call Session Control Function
  • HSS Home Subscriber Server
  • VCC AS 121 for taking charge of IMS-to-CS domain transfer.
  • the UE 101 preferably a dual-mode phone supporting both the CS network 110 and the IMS network 120 , supports domain transfer between CS and IMS networks.
  • the UE 101 supports a Mobility Event Package (MEP) method, which is an information exchange method with the VCC AS 121 , and also supports a function in which the user can select an IMS-Only mode according to the user preference.
  • MEP Mobility Event Package
  • the UE 101 should be able to recognize an IMS deregistration state when leaving the IMS domain, and in this case, the user preference state should change from the IMS Only Mode to the IMS preferred mode.
  • the VCC AS 121 supports the MEP that exchanges information with the UE 101 immediately after the registration or exchanges information with the UE 101 when the session information changes due to the selection of the operator and the user.
  • a Serving-CSCF (S-CSCF) 133 takes charge of call setup/release between terminating and originating UEs, and updates service subscriber information (or Service Profile) at the request of the HSS 123 when IMS mode information of the UE 101 is delivered to the VCC AS 121 .
  • the S-CSCF 133 receives a profile (or unregistered user profile) of the VCC user from the HSS 123 , determining that the corresponding VCC user is a VCC user unregistered in the IMS domain depending on an INVITE message of the corresponding call. Thereafter, the S-CSCF 133 forwards the corresponding call to the VCC AS 121 through the profile of the VCC user. Thereafter, the VCC AS 121 reroutes the corresponding call to the CS domain through HLR inquiry.
  • the HSS 123 stores the service subscriber information.
  • the HSS 123 updates the service subscriber information at the request of the VCC AS 121 .
  • the HSS 123 updates service subscriber information of the S-CSCF 133 by interworking with the S-CSCF 133 via a Cx interface.
  • the HSS 123 stores the profile of the unregistered VCC user for the originating call setup of the unregistered user.
  • An HLR 115 manages service subscriber information in the CS domain.
  • the VCC AS 121 when the subscriber performs IMS registration, recognizing the VCC AS 121 as a logical Mobile Switching Center (MSC), the VCC AS 121 performs subscriber location registration on the HLR 115 , like the MSC 111 .
  • the HLR 115 allows, for the call request, the MSC 111 to which the corresponding subscriber belongs to be allocated a Temporary Local Directory Number (TLDN) which is identification information of a Media Gateway Control Function (MGCF) 125 and a Media Gateway (MGW) 127 , to deliver the TLDN to the call-requested MSC 111 , achieving the requested call.
  • TLDN Temporary Local Directory Number
  • MGCF Media Gateway Control Function
  • MGW Media Gateway
  • the VCC AS 121 allocates and sends an IMS Routing Number (IMRN) other than TLDN, and the call-requesting MSC 111 terminates the corresponding call to the IMS network 120 .
  • IMRN IMS Routing Number
  • FIG. 2 illustrates an IMS registration method of a VCC subscriber in a heterogeneous communication system according to an embodiment of the present invention.
  • the transfer method between the IMS domain and the CS domain will be described based on the 3GPP and 3GPP2 standards.
  • a UE 101 performs a standard IMS registration process with an IMS domain 120 in step 201 for its registration in the IMS domain, and then performs service registration (VCC 3rd Party Registration) of the UE 101 in step 203 . Thereafter, the UE 101 sends a request for MEP registration to a VCC AS 121 using an MEP subscribe message, in steps 205 through 209 .
  • the subscribe message providing a unique identification number of a UE used in the CS domain, is sent to the VCC AS 121 along with a Mobile Identification Number/Electronic Serial Number (MIN/ESN) when the UE operates in the Code Division Multiple Access (CDMA) system, and with an International Mobile Subscriber Identity/International Mobile Equipment Identity (IMSI/IMEI) when the UE operates in the Global System for Mobile telecommunication (GSM) system.
  • MIN/ESN Mobile Identification Number/Electronic Serial Number
  • IMSI/IMEI International Mobile Subscriber Identity/International Mobile Equipment Identity
  • the VCC AS 121 Upon receipt of the subscribe message with MIN/ESN or IMSI/IMEI, the VCC AS 121 sends a response message (e.g. a 200 OK message) to the UE 101 , in steps 211 to 215 . Further, in steps 217 to 219 , the VCC AS 121 allocates a VCC Domain Transfer Number (VDTN) to be used when the UE 101 will make domain transfer from the IMS domain 120 to the CS domain 110 , and delivers it to the UE 101 using a MEP Notify message, in step 221 .
  • VDTN VCC Domain Transfer Number
  • the UE 101 Upon receipt of the Notify message, the UE 101 sends a response message i.e. 200 OK message) to the VCC AS 121 in response thereto, in steps 223 to 226 , completing IMS registration.
  • a response message i.e. 200 OK message
  • the VCC AS 121 After completion of the IMS registration, the VCC AS 121 performs location registration in the HLR 115 . To this end, the VCC AS 121 sends a Registration Notification (RegNot) message for location registration to the HLR 115 in step 227 . Upon receipt of the Request message or the Registration Notification (RegNot) message, the HLR 115 sends a Response message (RepNot) to the VCC AS 121 in response thereto in step 229 , completing the location registration process. The location registration by the HLR 115 in steps 227 and 229 uses the MIN/ESN or IMSI/IMEI of the UE 101 .
  • a Registration Notification (RegNot) message for location registration to the HLR 115 in step 227 .
  • the HLR 115 Upon receipt of the Request message or the Registration Notification (RegNot) message, the HLR 115 sends a Response message (RepNot) to the VCC AS 121 in response thereto in step 229 , completing the location registration
  • FIG. 3 illustrates a terminating call setup method according to an embodiment of the present invention, and the process shown in FIG. 3 is a process of terminating a terminating call from a CS network to an IMS network.
  • the MSC 111 when a terminating call has arrived at an MSC 111 of a CS domain 110 from other network such as Public Switched Telephone Network/Public Land Mobile Network (PSTN/PLMN), the MSC 111 sends a request for call termination information to an HLR 115 using a VCC subscriber number, or Mobile Station ISDN Number (MSISDN), of the terminating UE 101 in step 301 .
  • the HLR 115 checks, in step 303 , HLR location registration information according to the standard procedure, and then sends a request for location information to the VCC AS 121 in which the terminating UE 101 is now registered.
  • the VCC AS 121 because it is operating as a logical MSC, allocates an IMRN for the subscriber and returns the allocated IMRN to the HLR 115 in step 305 .
  • the HLR 115 Upon receipt of the IMRN, the HLR 115 delivers the IMRN to the MSC 111 , in step 307 .
  • the MSC 111 reroutes the terminating call to the IMS domain 120 using the IMRN received from the HLR 115 .
  • the MSC 111 routes, in step 309 , the terminating call to an MGCF 125 of the IMS domain 120 using an Initial Address Message (IAM) including the IMRN.
  • IAM Initial Address Message
  • the MGCF 125 sends in step 311 an INVITE message with the IMRN to an Interrogating-CSCF (I-CSCF) 131 .
  • I-CSCF Interrogating-CSCF
  • the I-CSCF 131 analogizes a VCC AS Public Service Identity (PSI) using the IMRN, and checks an address of the VCC AS from the HSS 123 in step 312 .
  • PSI Public Service Identity
  • the I-CSCF 131 sends an INVITE message to the corresponding VCC AS 121 in step 313 , and the VCC AS 121 performs call termination in step 315 .
  • the VCC AS 121 finds a MSISDN number, which is the original VCC subscriber number of the call-requested UE 101 , using the IMRN included in the received INVITE message, and sends an INVITE message back to the S-CSCF 133 of the IMS, requesting the call origination.
  • the S-CSCF 133 processes a terminating initial Filter Criteria (iFC) of the subscriber profile for the requested INVITE message, and routes the INVITE message to the VCC AS 121 for anchoring, after determining that the terminating UE 101 is a VCC subscriber.
  • iFC terminating initial Filter Criteria
  • the VCC AS 121 anchors the call of the terminating UE in step 321 , and then performs call termination to the terminating UE 101 , in steps 323 and 325 .
  • the termination process from the CS call to the IMS call has been described.
  • the call termination to the CS domain does not pass through the VCC AS by using the subscriber information shared between the HLR of the CS network and the VCC AS of the IMS network, as done in the embodiment of the present invention. Therefore, the terminating CS call can be processed according to the normal terminating call processing process.
  • the normal terminating call processing process is-known to those skilled in the art, and a detailed description thereof is omitted for conciseness.
  • the voice call processing method shares subscriber information between the CS domain and the IMS domain, thereby enabling fast call processing and allowing the UE to perform handoff from the IMS domain to the CS domain.
  • the terminating call processing between the CS calls does not pass through the IMS domain, facilitating the efficient processing.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Mobile Radio Communication Systems (AREA)
US11/999,498 2006-12-04 2007-12-04 Heterogeneous communication system and method for processing call in the same system Expired - Fee Related US8750869B2 (en)

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KR10-2006-0121839 2006-12-04
KR1020060121839A KR100943586B1 (ko) 2006-12-04 2006-12-04 이종 통신 시스템과, 이종 통신 시스템에서의 호 처리 방법
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KR101629815B1 (ko) * 2010-04-19 2016-06-13 주식회사 케이티 Ｓｃｃ를 지원하는 3ｇ 이동통신 시스템 및 그 방법
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KR100943586B1 (ko) 2010-02-23
EP2089995A1 (fr) 2009-08-19
KR20080050920A (ko) 2008-06-10
US20080153490A1 (en) 2008-06-26
WO2008069545A1 (fr) 2008-06-12
EP2089995A4 (fr) 2010-05-26
EP2089995B1 (fr) 2020-01-29

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